Cheat mode
At the title screen, hold Z and press A, B, R, A(2), B, R, A to unlock all selections in the Puzzle University.

High speed marathon mode
At the title screen, hold Z and press B, A, L(2) to be able set the starting speed in marathon mode to a maximum of 99. Alternately, score at least ten thousand points in the time zone.

Bonus trainers
At the trainer selection screen, hold L + R + Z on controller one and two to unlock the trainers marked by a "?". Alternately, successfully complete the Spa Service game.

Mewtwo's stage
At the trainer selection screen, hold Z and press B, Up, L, B, A, Start, A, Up, R to start the game in Mewtwo's stage. Player one will be Ash, player two will be Mewtwo. Alternately, successfully complete the game on the S-Hard difficulty setting.

No Continues Trick
When you lose a match, and it asks if you want to continue, just press No. Then go back to 1P Stadium and continue your game. This way you start out where you left off, but it doesn't count as a continue on your Record.